Starting from 1st January 2023, consular fees can be card paid only, to the account of the Embassy of the Republic of Serbia in London:

Account holder: Embassy of the Republic of Serbia
Bank Name: Barclays Bank
Sort code: 20-47-34
Account number: 23652416

Reference payment: First and last name, consular request (for example: passport, signature verification, birth registration, citizenship admission, etc.). The price list of the consular services is  here

When submitting the request, the proof of payment must be given to the Consular Department.